OnePlus One the flagship killer phone (Available through invitation only) is expecting the Android Lollipop soon. The official announcement is made on their forum with the releasing dates. And if they missed any of the deadlines they will be giving away 5 64 GB OnePlus One phones to the users. You will have to leave a comment on the forum topic to qualified for the post.
So the deadlines
CM 12S: The official OTA update for the OnePlus One will be released on or before March 30, 2015
OxygenOS: The official release of our own Lollipop-based ROM will be available for download on or before March 27, 2015
So it is close just less than 10 days. As a OnePlus owner I too waiting for this OxygenOS to test on my mighty 64Gb OnePlus One. If you are interested in giveaway (incase they missed the deadline) you can go ahead and leave a comment on this forum post Android Lollipop Update – Official Release Dates